Option C
The equation would we use to find the value of x is x + x + 2 + 9 = 29
Solution:
Given that perimeter of triangle is 29 units
Also given that triangle has one side that measures 9 units, another side that measures x, and a third side that measures 2 units more than x
length of one side = 9 units
length of another side = x
length of third side = 2 + x
The perimeter of triangle is given as:
perimeter = a + b + c
Where , "a" , "b" , "c" are the length of third sides of triangle
29 = 9 + x + 2 + x
x + x + 2 + 9 = 29
Thus option C is correct